/* * Copyright © 2013 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. * * Authors: * Brad Volkin * */ #include "i915_drv.h" /** * DOC: batch buffer command parser * * Motivation: * Certain OpenGL features (e.g. transform feedback, performance monitoring) * require userspace code to submit batches containing commands such as * MI_LOAD_REGISTER_IMM to access various registers. Unfortunately, some * generations of the hardware will noop these commands in "unsecure" batches * (which includes all userspace batches submitted via i915) even though the * commands may be safe and represent the intended programming model of the * device. * * The software command parser is similar in operation to the command parsing * done in hardware for unsecure batches. However, the software parser allows * some operations that would be noop'd by hardware, if the parser determines * the operation is safe, and submits the batch as "secure" to prevent hardware * parsing. * * Threats: * At a high level, the hardware (and software) checks attempt to prevent * granting userspace undue privileges. There are three categories of privilege. * * First, commands which are explicitly defined as privileged or which should * only be used by the kernel driver. The parser generally rejects such * commands, though it may allow some from the drm master process. * * Second, commands which access registers. To support correct/enhanced * userspace functionality, particularly certain OpenGL extensions, the parser * provides a whitelist of registers which userspace may safely access (for both * normal and drm master processes). * * Third, commands which access privileged memory (i.e. GGTT, HWS page, etc). * The parser always rejects such commands. * * The majority of the problematic commands fall in the MI_* range, with only a * few specific commands on each ring (e.g. PIPE_CONTROL and MI_FLUSH_DW). * * Implementation: * Each ring maintains tables of commands and registers which the parser uses in * scanning batch buffers submitted to that ring. * * Since the set of commands that the parser must check for is significantly * smaller than the number of commands supported, the parser tables contain only * those commands required by the parser. This generally works because command * opcode ranges have standard command length encodings. So for commands that * the parser does not need to check, it can easily skip them. This is * implemented via a per-ring length decoding vfunc. * * Unfortunately, there are a number of commands that do not follow the standard * length encoding for their opcode range, primarily amongst the MI_* commands. * To handle this, the parser provides a way to define explicit "skip" entries * in the per-ring command tables. * * Other command table entries map fairly directly to high level categories * mentioned above: rejected, master-only, register whitelist. The parser * implements a number of checks, including the privileged memory checks, via a * general bitmasking mechanism. */ #define STD_MI_OPCODE_MASK 0xFF800000 #define STD_3D_OPCODE_MASK 0xFFFF0000 #define STD_2D_OPCODE_MASK 0xFFC00000 #define STD_MFX_OPCODE_MASK 0xFFFF0000 #define CMD(op, opm, f, lm, fl, ...) \ { \ .flags = (fl) | ((f) ? CMD_DESC_FIXED : 0), \ .cmd = { (op), (opm) }, \ .length = { (lm) }, \ __VA_ARGS__ \ } /* Convenience macros to compress the tables */ #define SMI STD_MI_OPCODE_MASK #define S3D STD_3D_OPCODE_MASK #define S2D STD_2D_OPCODE_MASK #define SMFX STD_MFX_OPCODE_MASK #define F true #define S CMD_DESC_SKIP #define R CMD_DESC_REJECT #define W CMD_DESC_REGISTER #define B CMD_DESC_BITMASK #define M CMD_DESC_MASTER /* Command Mask Fixed Len Action ---------------------------------------------------------- */ static const struct drm_i915_cmd_descriptor common_cmds[] = { CMD( MI_NOOP, SMI, F, 1, S ), CMD( MI_USER_INTERRUPT, SMI, F, 1, R ), CMD( MI_WAIT_FOR_EVENT, SMI, F, 1, M ), CMD( MI_ARB_CHECK, SMI, F, 1, S ), CMD( MI_REPORT_HEAD, SMI, F, 1, S ), CMD( MI_SUSPEND_FLUSH, SMI, F, 1, S ), CMD( MI_SEMAPHORE_MBOX, SMI, !F, 0xFF, R ), CMD( MI_STORE_DWORD_INDEX, SMI, !F, 0xFF, R ), CMD( MI_LOAD_REGISTER_IMM(1), SMI, !F, 0xFF, W, .reg = { .offset = 1, .mask = 0x007FFFFC } ), CMD( MI_STORE_REGISTER_MEM(1), SMI, !F, 0xFF, W | B, .reg = { .offset = 1, .mask = 0x007FFFFC }, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_LOAD_REGISTER_MEM, SMI, !F, 0xFF, W | B, .reg = { .offset = 1, .mask = 0x007FFFFC }, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_BATCH_BUFFER_START, SMI, !F, 0xFF, S ), }; static const struct drm_i915_cmd_descriptor render_cmds[] = { CMD( MI_FLUSH, SMI, F, 1, S ), CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), CMD( MI_PREDICATE, SMI, F, 1, S ), CMD( MI_TOPOLOGY_FILTER, SMI, F, 1, S ), CMD( MI_DISPLAY_FLIP, SMI, !F, 0xFF, R ), CMD( MI_SET_CONTEXT, SMI, !F, 0xFF, R ), CMD( MI_URB_CLEAR, SMI, !F, 0xFF, S ), CMD( MI_STORE_DWORD_IMM, SMI, !F, 0x3F, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_UPDATE_GTT, SMI, !F, 0xFF, R ), CMD( MI_CLFLUSH, SMI, !F, 0x3FF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_REPORT_PERF_COUNT, SMI, !F, 0x3F, B, .bits = {{ .offset = 1, .mask = MI_REPORT_PERF_COUNT_GGTT, .expected = 0, }}, ), CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( GFX_OP_3DSTATE_VF_STATISTICS, S3D, F, 1, S ), CMD( PIPELINE_SELECT, S3D, F, 1, S ), CMD( MEDIA_VFE_STATE, S3D, !F, 0xFFFF, B, .bits = {{ .offset = 2, .mask = MEDIA_VFE_STATE_MMIO_ACCESS_MASK, .expected = 0, }}, ), CMD( GPGPU_OBJECT, S3D, !F, 0xFF, S ), CMD( GPGPU_WALKER, S3D, !F, 0xFF, S ), CMD( GFX_OP_3DSTATE_SO_DECL_LIST, S3D, !F, 0x1FF, S ), CMD( GFX_OP_PIPE_CONTROL(5), S3D, !F, 0xFF, B, .bits = {{ .offset = 1, .mask = (PIPE_CONTROL_MMIO_WRITE | PIPE_CONTROL_NOTIFY), .expected = 0, }, { .offset = 1, .mask = (PIPE_CONTROL_GLOBAL_GTT_IVB | PIPE_CONTROL_STORE_DATA_INDEX), .expected = 0, .condition_offset = 1, .condition_mask = PIPE_CONTROL_POST_SYNC_OP_MASK, }}, ), }; static const struct drm_i915_cmd_descriptor hsw_render_cmds[] = { CMD( MI_SET_PREDICATE, SMI, F, 1, S ), CMD( MI_RS_CONTROL, SMI, F, 1, S ), CMD( MI_URB_ATOMIC_ALLOC, SMI, F, 1, S ), CMD( MI_RS_CONTEXT, SMI, F, 1, S ), CMD( MI_LOAD_SCAN_LINES_INCL, SMI, !F, 0x3F, M ), CMD( MI_LOAD_SCAN_LINES_EXCL, SMI, !F, 0x3F, R ), CMD( MI_LOAD_REGISTER_REG, SMI, !F, 0xFF, R ), CMD( MI_RS_STORE_DATA_IMM, SMI, !F, 0xFF, S ), CMD( MI_LOAD_URB_MEM, SMI, !F, 0xFF, S ), CMD( MI_STORE_URB_MEM, SMI, !F, 0xFF, S ), CMD( GFX_OP_3DSTATE_DX9_CONSTANTF_VS, S3D, !F, 0x7FF, S ), CMD( GFX_OP_3DSTATE_DX9_CONSTANTF_PS, S3D, !F, 0x7FF, S ), CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_VS, S3D, !F, 0x1FF, S ), CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_GS, S3D, !F, 0x1FF, S ), CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_HS, S3D, !F, 0x1FF, S ), CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_DS, S3D, !F, 0x1FF, S ), CMD( GFX_OP_3DSTATE_BINDING_TABLE_EDIT_PS, S3D, !F, 0x1FF, S ), }; static const struct drm_i915_cmd_descriptor video_cmds[] = { CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), CMD( MI_STORE_DWORD_IMM, SMI, !F, 0xFF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, .bits = {{ .offset = 0, .mask = MI_FLUSH_DW_NOTIFY, .expected = 0, }, { .offset = 1, .mask = MI_FLUSH_DW_USE_GTT, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }, { .offset = 0, .mask = MI_FLUSH_DW_STORE_INDEX, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }}, ), CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), /* * MFX_WAIT doesn't fit the way we handle length for most commands. * It has a length field but it uses a non-standard length bias. * It is always 1 dword though, so just treat it as fixed length. */ CMD( MFX_WAIT, SMFX, F, 1, S ), }; static const struct drm_i915_cmd_descriptor vecs_cmds[] = { CMD( MI_ARB_ON_OFF, SMI, F, 1, R ), CMD( MI_STORE_DWORD_IMM, SMI, !F, 0xFF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, .bits = {{ .offset = 0, .mask = MI_FLUSH_DW_NOTIFY, .expected = 0, }, { .offset = 1, .mask = MI_FLUSH_DW_USE_GTT, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }, { .offset = 0, .mask = MI_FLUSH_DW_STORE_INDEX, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }}, ), CMD( MI_CONDITIONAL_BATCH_BUFFER_END, SMI, !F, 0xFF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), }; static const struct drm_i915_cmd_descriptor blt_cmds[] = { CMD( MI_DISPLAY_FLIP, SMI, !F, 0xFF, R ), CMD( MI_STORE_DWORD_IMM, SMI, !F, 0x3FF, B, .bits = {{ .offset = 0, .mask = MI_GLOBAL_GTT, .expected = 0, }}, ), CMD( MI_UPDATE_GTT, SMI, !F, 0x3F, R ), CMD( MI_FLUSH_DW, SMI, !F, 0x3F, B, .bits = {{ .offset = 0, .mask = MI_FLUSH_DW_NOTIFY, .expected = 0, }, { .offset = 1, .mask = MI_FLUSH_DW_USE_GTT, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }, { .offset = 0, .mask = MI_FLUSH_DW_STORE_INDEX, .expected = 0, .condition_offset = 0, .condition_mask = MI_FLUSH_DW_OP_MASK, }}, ), CMD( COLOR_BLT, S2D, !F, 0x3F, S ), CMD( SRC_COPY_BLT, S2D, !F, 0x3F, S ), }; static const struct drm_i915_cmd_descriptor hsw_blt_cmds[] = { CMD( MI_LOAD_SCAN_LINES_INCL, SMI, !F, 0x3F, M ), CMD( MI_LOAD_SCAN_LINES_EXCL, SMI, !F, 0x3F, R ), }; #undef CMD #undef SMI #undef S3D #undef S2D #undef SMFX #undef F #undef S #undef R #undef W #undef B #undef M static const struct drm_i915_cmd_table gen7_render_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { render_cmds, ARRAY_SIZE(render_cmds) }, }; static const struct drm_i915_cmd_table hsw_render_ring_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { render_cmds, ARRAY_SIZE(render_cmds) }, { hsw_render_cmds, ARRAY_SIZE(hsw_render_cmds) }, }; static const struct drm_i915_cmd_table gen7_video_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { video_cmds, ARRAY_SIZE(video_cmds) }, }; static const struct drm_i915_cmd_table hsw_vebox_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { vecs_cmds, ARRAY_SIZE(vecs_cmds) }, }; static const struct drm_i915_cmd_table gen7_blt_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { blt_cmds, ARRAY_SIZE(blt_cmds) }, }; static const struct drm_i915_cmd_table hsw_blt_ring_cmds[] = { { common_cmds, ARRAY_SIZE(common_cmds) }, { blt_cmds, ARRAY_SIZE(blt_cmds) }, { hsw_blt_cmds, ARRAY_SIZE(hsw_blt_cmds) }, }; /* * Register whitelists, sorted by increasing register offset. * * Some registers that userspace accesses are 64 bits. The register * access commands only allow 32-bit accesses. Hence, we have to include * entries for both halves of the 64-bit registers. */ /* Convenience macro for adding 64-bit registers */ #define REG64(addr) (addr), (addr + sizeof(u32)) static const u32 gen7_render_regs[] = { REG64(HS_INVOCATION_COUNT), REG64(DS_INVOCATION_COUNT), REG64(IA_VERTICES_COUNT), REG64(IA_PRIMITIVES_COUNT), REG64(VS_INVOCATION_COUNT), REG64(GS_INVOCATION_COUNT), REG64(GS_PRIMITIVES_COUNT), REG64(CL_INVOCATION_COUNT), REG64(CL_PRIMITIVES_COUNT), REG64(PS_INVOCATION_COUNT), REG64(PS_DEPTH_COUNT), OACONTROL, /* Only allowed for LRI and SRM. See below. */ GEN7_3DPRIM_END_OFFSET, GEN7_3DPRIM_START_VERTEX, GEN7_3DPRIM_VERTEX_COUNT, GEN7_3DPRIM_INSTANCE_COUNT, GEN7_3DPRIM_START_INSTANCE, GEN7_3DPRIM_BASE_VERTEX, REG64(GEN7_SO_NUM_PRIMS_WRITTEN(0)), REG64(GEN7_SO_NUM_PRIMS_WRITTEN(1)), REG64(GEN7_SO_NUM_PRIMS_WRITTEN(2)), REG64(GEN7_SO_NUM_PRIMS_WRITTEN(3)), REG64(GEN7_SO_PRIM_STORAGE_NEEDED(0)), REG64(GEN7_SO_PRIM_STORAGE_NEEDED(1)), REG64(GEN7_SO_PRIM_STORAGE_NEEDED(2)), REG64(GEN7_SO_PRIM_STORAGE_NEEDED(3)), GEN7_SO_WRITE_OFFSET(0), GEN7_SO_WRITE_OFFSET(1), GEN7_SO_WRITE_OFFSET(2), GEN7_SO_WRITE_OFFSET(3), GEN7_L3SQCREG1, GEN7_L3CNTLREG2, GEN7_L3CNTLREG3, }; static const u32 gen7_blt_regs[] = { BCS_SWCTRL, }; static const u32 ivb_master_regs[] = { FORCEWAKE_MT, DERRMR, GEN7_PIPE_DE_LOAD_SL(PIPE_A), GEN7_PIPE_DE_LOAD_SL(PIPE_B), GEN7_PIPE_DE_LOAD_SL(PIPE_C), }; static const u32 hsw_master_regs[] = { FORCEWAKE_MT, DERRMR, }; #undef REG64 static u32 gen7_render_get_cmd_length_mask(u32 cmd_header) { u32 client = (cmd_header & INSTR_CLIENT_MASK) >> INSTR_CLIENT_SHIFT; u32 subclient = (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT; if (client == INSTR_MI_CLIENT) return 0x3F; else if (client == INSTR_RC_CLIENT) { if (subclient == INSTR_MEDIA_SUBCLIENT) return 0xFFFF; else return 0xFF; } DRM_DEBUG_DRIVER("CMD: Abnormal rcs cmd length! 0x%08X\n", cmd_header); return 0; } static u32 gen7_bsd_get_cmd_length_mask(u32 cmd_header) { u32 client = (cmd_header & INSTR_CLIENT_MASK) >> INSTR_CLIENT_SHIFT; u32 subclient = (cmd_header & INSTR_SUBCLIENT_MASK) >> INSTR_SUBCLIENT_SHIFT; if (client == INSTR_MI_CLIENT) return 0x3F; else if (client == INSTR_RC_CLIENT) { if (subclient == INSTR_MEDIA_SUBCLIENT) return 0xFFF; else return 0xFF; } DRM_DEBUG_DRIVER("CMD: Abnormal bsd cmd length! 0x%08X\n", cmd_header); return 0; } static u32 gen7_blt_get_cmd_length_mask(u32 cmd_header) { u32 client = (cmd_header & INSTR_CLIENT_MASK) >> INSTR_CLIENT_SHIFT; if (client == INSTR_MI_CLIENT) return 0x3F; else if (client == INSTR_BC_CLIENT) return 0xFF; DRM_DEBUG_DRIVER("CMD: Abnormal blt cmd length! 0x%08X\n", cmd_header); return 0; } static bool validate_cmds_sorted(struct intel_engine_cs *ring, const struct drm_i915_cmd_table *cmd_tables, int cmd_table_count) { int i; bool ret = true; if (!cmd_tables || cmd_table_count == 0) return true; for (i = 0; i < cmd_table_count; i++) { const struct drm_i915_cmd_table *table = &cmd_tables[i]; u32 previous = 0; int j; for (j = 0; j < table->count; j++) { const struct drm_i915_cmd_descriptor *desc = &table->table[i]; u32 curr = desc->cmd.value & desc->cmd.mask; if (curr < previous) { DRM_ERROR("CMD: table not sorted ring=%d table=%d entry=%d cmd=0x%08X prev=0x%08X\n", ring->id, i, j, curr, previous); ret = false; } previous = curr; } } return ret; } static bool check_sorted(int ring_id, const u32 *reg_table, int reg_count) { int i; u32 previous = 0; bool ret = true; for (i = 0; i < reg_count; i++) { u32 curr = reg_table[i]; if (curr < previous) { DRM_ERROR("CMD: table not sorted ring=%d entry=%d reg=0x%08X prev=0x%08X\n", ring_id, i, curr, previous); ret = false; } previous = curr; } return ret; } static bool validate_regs_sorted(struct intel_engine_cs *ring) { return check_sorted(ring->id, ring->reg_table, ring->reg_count) && check_sorted(ring->id, ring->master_reg_table, ring->master_reg_count); } struct cmd_node { const struct drm_i915_cmd_descriptor *desc; struct hlist_node node; }; /* * Different command ranges have different numbers of bits for the opcode. For * example, MI commands use bits 31:23 while 3D commands use bits 31:16. The * problem is that, for example, MI commands use bits 22:16 for other fields * such as GGTT vs PPGTT bits. If we include those bits in the mask then when * we mask a command from a batch it could hash to the wrong bucket due to * non-opcode bits being set. But if we don't include those bits, some 3D * commands may hash to the same bucket due to not including opcode bits that * make the command unique. For now, we will risk hashing to the same bucket. * * If we attempt to generate a perfect hash, we should be able to look at bits * 31:29 of a command from a batch buffer and use the full mask for that * client. The existing INSTR_CLIENT_MASK/SHIFT defines can be used for this. */ #define CMD_HASH_MASK STD_MI_OPCODE_MASK static int init_hash_table(struct intel_engine_cs *ring, const struct drm_i915_cmd_table *cmd_tables, int cmd_table_count) { int i, j; hash_init(ring->cmd_hash); for (i = 0; i < cmd_table_count; i++) { const struct drm_i915_cmd_table *table = &cmd_tables[i]; for (j = 0; j < table->count; j++) { const struct drm_i915_cmd_descriptor *desc = &table->table[j]; struct cmd_node *desc_node = kmalloc(sizeof(*desc_node), GFP_KERNEL); if (!desc_node) return -ENOMEM; desc_node->desc = desc; hash_add(ring->cmd_hash, &desc_node->node, desc->cmd.value & CMD_HASH_MASK); } } return 0; } static void fini_hash_table(struct intel_engine_cs *ring) { struct hlist_node *tmp; struct cmd_node *desc_node; int i; hash_for_each_safe(ring->cmd_hash, i, tmp, desc_node, node) { hash_del(&desc_node->node); kfree(desc_node); } } /** * i915_cmd_parser_init_ring() - set cmd parser related fields for a ringbuffer * @ring: the ringbuffer to initialize * * Optionally initializes fields related to batch buffer command parsing in the * struct intel_engine_cs based on whether the platform requires software * command parsing. * * Return: non-zero if initialization fails */ int i915_cmd_parser_init_ring(struct intel_engine_cs *ring) { const struct drm_i915_cmd_table *cmd_tables; int cmd_table_count; int ret; if (!IS_GEN7(ring->dev)) return 0; switch (ring->id) { case RCS: if (IS_HASWELL(ring->dev)) { cmd_tables = hsw_render_ring_cmds; cmd_table_count = ARRAY_SIZE(hsw_render_ring_cmds); } else { cmd_tables = gen7_render_cmds; cmd_table_count = ARRAY_SIZE(gen7_render_cmds); } ring->reg_table = gen7_render_regs; ring->reg_count = ARRAY_SIZE(gen7_render_regs); if (IS_HASWELL(ring->dev)) { ring->master_reg_table = hsw_master_regs; ring->master_reg_count = ARRAY_SIZE(hsw_master_regs); } else { ring->master_reg_table = ivb_master_regs; ring->master_reg_count = ARRAY_SIZE(ivb_master_regs); } ring->get_cmd_length_mask = gen7_render_get_cmd_length_mask; break; case VCS: cmd_tables = gen7_video_cmds; cmd_table_count = ARRAY_SIZE(gen7_video_cmds); ring->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask; break; case BCS: if (IS_HASWELL(ring->dev)) { cmd_tables = hsw_blt_ring_cmds; cmd_table_count = ARRAY_SIZE(hsw_blt_ring_cmds); } else { cmd_tables = gen7_blt_cmds; cmd_table_count = ARRAY_SIZE(gen7_blt_cmds); } ring->reg_table = gen7_blt_regs; ring->reg_count = ARRAY_SIZE(gen7_blt_regs); if (IS_HASWELL(ring->dev)) { ring->master_reg_table = hsw_master_regs; ring->master_reg_count = ARRAY_SIZE(hsw_master_regs); } else { ring->master_reg_table = ivb_master_regs; ring->master_reg_count = ARRAY_SIZE(ivb_master_regs); } ring->get_cmd_length_mask = gen7_blt_get_cmd_length_mask; break; case VECS: cmd_tables = hsw_vebox_cmds; cmd_table_count = ARRAY_SIZE(hsw_vebox_cmds); /* VECS can use the same length_mask function as VCS */ ring->get_cmd_length_mask = gen7_bsd_get_cmd_length_mask; break; default: DRM_ERROR("CMD: cmd_parser_init with unknown ring: %d\n", ring->id); BUG(); } BUG_ON(!validate_cmds_sorted(ring, cmd_tables, cmd_table_count)); BUG_ON(!validate_regs_sorted(ring)); if (hash_empty(ring->cmd_hash)) { ret = init_hash_table(ring, cmd_tables, cmd_table_count); if (ret) { DRM_ERROR("CMD: cmd_parser_init failed!\n"); fini_hash_table(ring); return ret; } } ring->needs_cmd_parser = true; return 0; } /** * i915_cmd_parser_fini_ring() - clean up cmd parser related fields * @ring: the ringbuffer to clean up * * Releases any resources related to command parsing that may have been * initialized for the specified ring. */ void i915_cmd_parser_fini_ring(struct intel_engine_cs *ring) { if (!ring->needs_cmd_parser) return; fini_hash_table(ring); } static const struct drm_i915_cmd_descriptor* find_cmd_in_table(struct intel_engine_cs *ring, u32 cmd_header) { struct cmd_node *desc_node; hash_for_each_possible(ring->cmd_hash, desc_node, node, cmd_header & CMD_HASH_MASK) { const struct drm_i915_cmd_descriptor *desc = desc_node->desc; u32 masked_cmd = desc->cmd.mask & cmd_header; u32 masked_value = desc->cmd.value & desc->cmd.mask; if (masked_cmd == masked_value) return desc; } return NULL; } /* * Returns a pointer to a descriptor for the command specified by cmd_header. * * The caller must supply space for a default descriptor via the default_desc * parameter. If no descriptor for the specified command exists in the ring's * command parser tables, this function fills in default_desc based on the * ring's default length encoding and returns default_desc. */ static const struct drm_i915_cmd_descriptor* find_cmd(struct intel_engine_cs *ring, u32 cmd_header, struct drm_i915_cmd_descriptor *default_desc) { const struct drm_i915_cmd_descriptor *desc; u32 mask; desc = find_cmd_in_table(ring, cmd_header); if (desc) return desc; mask = ring->get_cmd_length_mask(cmd_header); if (!mask) return NULL; BUG_ON(!default_desc); default_desc->flags = CMD_DESC_SKIP; default_desc->length.mask = mask; return default_desc; } static bool valid_reg(const u32 *table, int count, u32 addr) { if (table && count != 0) { int i; for (i = 0; i < count; i++) { if (table[i] == addr) return true; } } return false; } static u32 *vmap_batch(struct drm_i915_gem_object *obj) { int i; void *addr = NULL; struct sg_page_iter sg_iter; struct page **pages; pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages)); if (pages == NULL) { DRM_DEBUG_DRIVER("Failed to get space for pages\n"); goto finish; } i = 0; for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) { pages[i] = sg_page_iter_page(&sg_iter); i++; } addr = vmap(pages, i, 0, PAGE_KERNEL); if (addr == NULL) { DRM_DEBUG_DRIVER("Failed to vmap pages\n"); goto finish; } finish: if (pages) drm_free_large(pages); return (u32*)addr; } /** * i915_needs_cmd_parser() - should a given ring use software command parsing? * @ring: the ring in question * * Only certain platforms require software batch buffer command parsing, and * only when enabled via module parameter. * * Return: true if the ring requires software command parsing */ bool i915_needs_cmd_parser(struct intel_engine_cs *ring) { if (!ring->needs_cmd_parser) return false; if (!USES_PPGTT(ring->dev)) return false; return (i915.enable_cmd_parser == 1); } static bool check_cmd(const struct intel_engine_cs *ring, const struct drm_i915_cmd_descriptor *desc, const u32 *cmd, const bool is_master, bool *oacontrol_set) { if (desc->flags & CMD_DESC_REJECT) { DRM_DEBUG_DRIVER("CMD: Rejected command: 0x%08X\n", *cmd); return false; } if ((desc->flags & CMD_DESC_MASTER) && !is_master) { DRM_DEBUG_DRIVER("CMD: Rejected master-only command: 0x%08X\n", *cmd); return false; } if (desc->flags & CMD_DESC_REGISTER) { u32 reg_addr = cmd[desc->reg.offset] & desc->reg.mask; /* * OACONTROL requires some special handling for writes. We * want to make sure that any batch which enables OA also * disables it before the end of the batch. The goal is to * prevent one process from snooping on the perf data from * another process. To do that, we need to check the value * that will be written to the register. Hence, limit * OACONTROL writes to only MI_LOAD_REGISTER_IMM commands. */ if (reg_addr == OACONTROL) { if (desc->cmd.value == MI_LOAD_REGISTER_MEM) { DRM_DEBUG_DRIVER("CMD: Rejected LRM to OACONTROL\n"); return false; } if (desc->cmd.value == MI_LOAD_REGISTER_IMM(1)) *oacontrol_set = (cmd[2] != 0); } if (!valid_reg(ring->reg_table, ring->reg_count, reg_addr)) { if (!is_master || !valid_reg(ring->master_reg_table, ring->master_reg_count, reg_addr)) { DRM_DEBUG_DRIVER("CMD: Rejected register 0x%08X in command: 0x%08X (ring=%d)\n", reg_addr, *cmd, ring->id); return false; } } } if (desc->flags & CMD_DESC_BITMASK) { int i; for (i = 0; i < MAX_CMD_DESC_BITMASKS; i++) { u32 dword; if (desc->bits[i].mask == 0) break; if (desc->bits[i].condition_mask != 0) { u32 offset = desc->bits[i].condition_offset; u32 condition = cmd[offset] & desc->bits[i].condition_mask; if (condition == 0) continue; } dword = cmd[desc->bits[i].offset] & desc->bits[i].mask; if (dword != desc->bits[i].expected) { DRM_DEBUG_DRIVER("CMD: Rejected command 0x%08X for bitmask 0x%08X (exp=0x%08X act=0x%08X) (ring=%d)\n", *cmd, desc->bits[i].mask, desc->bits[i].expected, dword, ring->id); return false; } } } return true; } #define LENGTH_BIAS 2 /** * i915_parse_cmds() - parse a submitted batch buffer for privilege violations * @ring: the ring on which the batch is to execute * @batch_obj: the batch buffer in question * @batch_start_offset: byte offset in the batch at which execution starts * @is_master: is the submitting process the drm master? * * Parses the specified batch buffer looking for privilege violations as * described in the overview. * * Return: non-zero if the parser finds violations or otherwise fails */ int i915_parse_cmds(struct intel_engine_cs *ring, struct drm_i915_gem_object *batch_obj, u32 batch_start_offset, bool is_master) { int ret = 0; u32 *cmd, *batch_base, *batch_end; struct drm_i915_cmd_descriptor default_desc = { 0 }; int needs_clflush = 0; bool oacontrol_set = false; /* OACONTROL tracking. See check_cmd() */ ret = i915_gem_obj_prepare_shmem_read(batch_obj, &needs_clflush); if (ret) { DRM_DEBUG_DRIVER("CMD: failed to prep read\n"); return ret; } batch_base = vmap_batch(batch_obj); if (!batch_base) { DRM_DEBUG_DRIVER("CMD: Failed to vmap batch\n"); i915_gem_object_unpin_pages(batch_obj); return -ENOMEM; } if (needs_clflush) drm_clflush_virt_range((char *)batch_base, batch_obj->base.size); cmd = batch_base + (batch_start_offset / sizeof(*cmd)); batch_end = cmd + (batch_obj->base.size / sizeof(*batch_end)); while (cmd < batch_end) { const struct drm_i915_cmd_descriptor *desc; u32 length; if (*cmd == MI_BATCH_BUFFER_END) break; desc = find_cmd(ring, *cmd, &default_desc); if (!desc) { DRM_DEBUG_DRIVER("CMD: Unrecognized command: 0x%08X\n", *cmd); ret = -EINVAL; break; } if (desc->flags & CMD_DESC_FIXED) length = desc->length.fixed; else length = ((*cmd & desc->length.mask) + LENGTH_BIAS); if ((batch_end - cmd) < length) { DRM_DEBUG_DRIVER("CMD: Command length exceeds batch length: 0x%08X length=%u batchlen=%td\n", *cmd, length, batch_end - cmd); ret = -EINVAL; break; } if (!check_cmd(ring, desc, cmd, is_master, &oacontrol_set)) { ret = -EINVAL; break; } cmd += length; } if (oacontrol_set) { DRM_DEBUG_DRIVER("CMD: batch set OACONTROL but did not clear it\n"); ret = -EINVAL; } if (cmd >= batch_end) { DRM_DEBUG_DRIVER("CMD: Got to the end of the buffer w/o a BBE cmd!\n"); ret = -EINVAL; } vunmap(batch_base); i915_gem_object_unpin_pages(batch_obj); return ret; } /** * i915_cmd_parser_get_version() - get the cmd parser version number * * The cmd parser maintains a simple increasing integer version number suitable * for passing to userspace clients to determine what operations are permitted. * * Return: the current version number of the cmd parser */ int i915_cmd_parser_get_version(void) { /* * Command parser version history * * 1. Initial version. Checks batches and reports violations, but leaves * hardware parsing enabled (so does not allow new use cases). */ return 1; }